function showtime(){
	var today;
	var hour;
	var second;
	var minute;
	var year;
	var month;
	var date;
	var strDate;
	today = new Date();
	var n_day = today.getDay();
	switch(n_day){
	case 0:{strDate="星期日"}break;
	case 1:{strDate="星期一"}break;
	case 2:{strDate="星期二"}break;
	case 3:{strDate="星期三"}break;
	case 4:{strDate="星期四"}break;
	case 5:{strDate="星期五"}break;
	case 6:{strDate="星期六"}break;
	case 7:{strDate="星期日"}break;
	}
	year = today.getFullYear();
	month = today.getMonth()+1;
	date = today.getDate();
	hour = today.getHours();
	minute = today.getMinutes();
	second = today.getSeconds();
	if(month<10){month = "0"+month;}
	if(date<10){date = "0"+date;}
	if(hour<10){hour = "0"+hour;}
	if(minute<10){minute = "0"+minute;}
	if(second<10){second = "0"+second;}
	document.getElementById("clock").innerHTML = year+"年"+month+"月"+date+"日"+" "+hour+":"+minute+":"+second+"    "+strDate;
	setTimeout("showtime();",1000);
}